Training Class PROFINET FAQ

By 14 July 2014

In our One-Day Training Classes throughout the year, there seem to be a handful of questions that we receive from the audience relating to PROFINET that crop up time and again.

PROFINET Frequently Asked Questions

1) “Do PROFINET IRT messages have some sort of higher priority?”

The answer to this question is: no. PROFINET IRT (Isochronous Real Time) is used when multi-axis motion control is needed. Instead of using ‘priority’, IRT messages have a certain portion of the bandwidth reserved just for them. They are sent during this time-frame. This ensures that these time-critical messages are delivered with the highest determinism. Watch this 1-minute video for more:


2) “Do I need a managed switch for Simple Device Replacement?”

First of all, many PROFINET devices these days come with an SD card that stores the device’s configuration on non-volatile memory. If the device needs to be replaced, the user only needs to swap in the existing SD card; there’s no need to connect an engineering tool for configuration. For those without an SD card, ‘Simple Device Replacement’ allows the user to again swap in a replacement without using an engineering tool. Here’s how it works:

Since Simple Device Replacement leverages protocols like LLDP and SNMP, if dedicated switches are used in the network they’ll need to support these protocols. Typically, only managed switches have these features.

3) “Does PROFINET play nicely with wireless encryption?”

The answer is: absolutely. Wireless encryption is just another protocol. And since PROFINET is also built on unmodified Ethernet, the two play very nicely together. That being said, using wireless encryption (or any encryption for that matter) can lead to time delays or jitter. If your automation network can handle these, then it’s something to take into account during the network planning phase.Wireless

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